With the numbers of older persons in the Asia and Pacific region increasing rapidly, there is a growing urgency to develop and strengthen long-term care (LTC) support systems and services. This working paper aims to enhance the understanding, particularly of policy makers and those planning modeling studies, of using statistical models to project the need, demand, and cost of LTC services. The paper first outlines modeling and its importance. Second, it describes key concepts related to LTC need, demand, and measurement. Then, it identifies key issues to consider when designing and using models. A review of recent modeling studies is also summarized, drawing out lessons relevant to low- and middle- income countries.